Measurement of Michel Parameters ($\bar{\eta }$, $\xi \kappa$) in the radiative leptonic decay of tau at Belle

The Belle Collaboration, A. Abdesselam, I. Adachi +445

We present the first measurement of the Michel parameters $\bar{\eta }$ and $\xi \kappa$ in the radiative leptonic decay of the $\tau$ lepton using 703 f${\mathrm{b}}^{-1}$ of data collected with the…